yes they are leds already and very bright, but how ever,, i have started modification frency and took advice from my Finnish friend Ari who has done tons of mods to his bike and i did similar version with different colour lights.
Took off the rack
To able to open it took for a while
Drilled holes for 3, 3V LED and used 0.830ohm resistor (red dimm lights in the begining) later changed them to be bright yellow
Installed LED lights and solder them
After testing them, that they are working used HOT clue to keep them on place.
Again test them before re-assmbling the rack back to it's place
Now in the dark, with out original LED on place, that picture i forgot to take
I can say that they are really bright and relatevly easy to install,,i mean if I can do it,(Im with out official electrical knowledge, self studied (thats why i flew off few leds in the begining, but hey thay are so darn cheap anyhow)
Just on thing was, what i almost forgot,, as original (Red) LED cabling is going from Left side,when facing forward, small grinder is to be used and grind place to 4cable cord, it's easy and just take few minutes, then i clued(hot) again that in the place in few areas,so it' wont pop off during re-assabling.